Add web front-end and fix API issues

node_modules/rxjs/dist/esm5/internal/util/mapOneOrManyArgs.js

@@ -0,0 +1,10 @@
+import { __read, __spreadArray } from "tslib";
+import { map } from "../operators/map";
+var isArray = Array.isArray;
+function callOrApply(fn, args) {
+    return isArray(args) ? fn.apply(void 0, __spreadArray([], __read(args))) : fn(args);
+}
+export function mapOneOrManyArgs(fn) {
+    return map(function (args) { return callOrApply(fn, args); });
+}
+//# sourceMappingURL=mapOneOrManyArgs.js.map